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Variation in inflation pressure of off-the-road tire
Technical Paper
2000-05-0391
Sector:
Language:
English
Abstract
The purpose of this study is to grasp the actual variation in
the inflation pressure of large-sized, off-the-road pneumatic
tires. So far the inflation pressure of a tire was regarded as in
constant under operation. In this research, the variation of
inflation pressure was investigated in detail for a period of four
hundred days. The object of the investigation is 3300-R51 off-
the-road tires having an initial inflation pressure of 850 kPa used
in the heavy dump truck working in a quarry site of limestone at
Kochi Prefecture of Japan. The average variation of the inflation
pressure during 400 days and 9 pressure control per day was to be
controlled at 21 kPa.
The variation of 52 kPa in the inflation pressure within 8 hours
per ordinary working day was also measured and was about 2.5 times
the controlled variation. The temperature near the tire carcass was
also measured. It was observed that the variation of the inflation
pressure is accompanied by the variation of the temperature near
the tire carcass. Furthermore, it was verified that the variation
in the inflation pressure causes changes of load capacity, profile,
contact pressure distribution and form of wear. As a result, the
air pressure fluctuation could be controlled by using heat
insulator between air layer and carcass.
In addition to the aspect of conventional inflation pressure
control, the research also involves various aspects of tire
performances.